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Android's graphical authentication mechanism requires users to unlock their devices by "drawing" a pattern that connects a sequence of contact points arranged in a 3x3 grid. Prior studies demonstrated that human-generated 3x3 patterns are weak (CCS'13); large portions can be trivially guessed with sufficient training. An obvious solution would be to… (More)

This poster-abstract presents the results of an IRB approved survey studying Android unlock pattern choices as compared between two grid sizes (3x3 and 4x4); the smaller grid size is the current standard. We recruited 80 participants who chose both patterns for themselves and guesses of others' patterns, collecting 491 3x3 and 504 4x4 patterns. Patterns… (More)